Thomas Gage, the British Commander-in-chief at the outset of the American War of Independence, has not inspired many biographies. Ably, he served in North America during the French and Indian War and stayed in the colonies after this conflict. He is best known for ordering British forces to Lexington and Concord and the costly British assault on Bunker Hill.
Lord Germaine immediately recalled Gage after receiving the news of the Battle of Bunker Hill. Gage returned to England and lived the remaining years of his life in obscure retirement.
Primary Sources
Gage, Thomas, and Clarence Edwin Carter. The Correspondence of General Thomas Gage. Hamden, Conn.: Archon Books, 1969.
The Archon published book is available through second hand book sellers.
Gage, Thomas Papers and Correspondence at the University of Michigan William C. Clements Library
For online and on-site access information and a finding aid, click. The Clements Library is the largest repository of Gage Papers.
Secondary Sources
Hinman, Bonnie. General Thomas Gage: British General. Revolutionary War Leaders. Philadelphia: Chelsea House Publishers, 2002.

Where are the primary sources?
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Dustin, the two best sources of Thomas Gage primary sources are a book published by Archon Books and the William C. Clements Library at the University of Michigan which provides on-line and on-site access. See the Thomas Gage web page for more details.
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